Found in a documentation for radio amateurs from the 90s, this circuit is suitable for RF measurements in transmission systems. The potentiometer must be of a special type.
In a transmitter sequencer we have a high input impedance and a low output impedance. The voltage...
This basic configuration aof a touch switch controls a relay. Power supply can be 5, 6 or 12 V...
This circuit amplifies signals from low impedance sources as microphones, transducers, etc. For...